如何用delphi获取硬盘的唯一的序列号码（S N）

function GetVolumeID : string;
var
vVolumeNameBuffer: array[0..255]of Char;
vVolumeSerialNumber: DWORD;
vMaximumComponentLength: DWORD;
vFileSystemFlags: DWORD;
vFileSystemNameBuffer: array[0..255]of Char;
begin
if GetVolumeInformation('C:\', vVolumeNameBuffer, SizeOf(vVolumeNameBuffer),
@vVolumeSerialNumber, vMaximumComponentLength, vFileSystemFlags,
vFileSystemNameBuffer, SizeOf(vFileSystemNameBuffer)) then
begin
Result := IntToHex(vVolumeSerialNumber, 8);
end;
end;